Chuck.



A. HALTMAN.

CHUCK.

APPLICATION FlLED SEPT. [3| 1919- I 1,321,739. Patented Nov. 11,1919.

3 SHEETSSHEET I.

MAN.

APPLLCAT SEPT. 13. m9.

. A. HALTMAN.

CHUCK.

APPLICATION FILED SEPT. 13. 1919.

1,321,739. Patented Nov. 11, 1919.

3 SHEETSSHEET 3.

UNITED STATES PATENT,

ADOLF HALTMAN, or TOPEKA, KANSAS. ASSIGNOR or ONE-HALF 'ro 'ABN' R-LABQUNTY,

OF ToPEKsKANsAs.

cmiex. I

Application filed September 13,1919.. s= iaiu6.a2s,6o2. Y

To all whom. it may concern.

Be it known that I, ADOLF HAL'IMAN, a citizen of Finland. residing at- Topeka,-in the county of Shawnee and State of Kansas, have invented certain new and useful Im proven'ients in Chucks, of which the following is aspecification. 5

This invention relates to improvements in chucks and more particularly to selfcentering lathe chucks. One object is to provide a chuck of this type that is simple in construction and operation and efiicient in use. The chuck is of few parts, strongly made and not easilyput out of order. A further object is to provide a chuck in which the jaws are moved from closed position to maximum open position and back again into closed position by a. continuous operation of an actuating element which element is moving in one direction. The closing move-' ment of the jaws upon the work centers the same automatically.

With the foregoing and other objects in view the'invention consists in the combination and arrangement. of parts to be hereinafter fullydescribed, pointed out, in the appended claims and illustrated in the accompanying drawings which form a part of this specification andin whichj Figure 1 is a plan view of my improved chuck.

Fig. 2 is a view of the same in elcv'gtion, partof one jaw being broken away.

Fig, 3 is a cross section taken on line 3-3 of Fig. 2.

.Fig. 4 is a sectional view on line 4-4 of Fig. 3.

Fig. 5 is a perspective view of one jaw and actuating link. 7 v

Fig. 6 is an inverted fragmentary view of Fig. 5.

Fig. 7 is a side view of a jaw base.

- Fig. 8 is a side view of the body portion of one jaw.

Like reference characters denote corresponding parts throughout the several views.

My chuck comprises the cylindrical shell 1 which is threaded interiorly to receive the retaining or closing and mounting disk 2 .which disk is formed with the central perforation 3 and with the annular rib l which rib fits snugly in an annular groove formed in thelarge gear 5 that rotates directly upon Specification 0t Letters Patent, PatentedNo the disk 2, said gear being formed \\'1l,l'i "tl1E teeth Gandwith a central perforation '7 of the same size as, andlin a-linement'"witlijthe perforation?) 1n the disk 2. The-gear 5 is confined and revolves wholly within the shell 1. The shell 1 is formed with ithe face plate 8 having formed therein the central centric with the perforation 7 in the gear, the face of said plate 8 being spaced away from the gear 5 and-foiined with the radial slots 10, one hundred andtwenty degrees perforation 9 somewhat larger than but c0napart, which register with the perforations 11 in the, shell. The face plate 8- is of suliicient thickness to have the oppositely disposed ribs 12, 13 projecting from the walls of the slots. 4

The gear 5 .is formed with a plurality, in this instance three, of face studs 14-to which the links 15, 16, 17 are secured pivotally, each one of said links being movable over the face of the gear 5 and extending through the perforations 11 of the shell andeach of said links being engaged by one of the studs 18 that project.- fromeach of the stepped base blocks 19 that carry the jaws 20 which are formed with the sockets 21 adapted, w en ;-:i.id jaws rest upon the base blocks 15) to receive the studs 22 carried 'by said blocks. Bolts 23 serve to further secure the jaws to their blocks '19. The jaws 20 are which shaft is in mesh with and drives vthe gear 5. the exterior end of said shaft being square. in cross section .to receive the end of a bit to effect the desired rotation. Rotation of the screw shaft will rotate the gear '5 and so-cause movement of the links '15-,

16, 17 simultaneously thus-causing similar movement of the jaws. In the position of the links shown dotted at A, Fig. 3, the jaws 20 are closed; int-he intermediate position of the links shown in full 1lneS 'l llG jaws are opened to approximately the maximum degree andat the osition of'the links'shown detects- B'theqaws' arenosed The direction.

1. In a chuc'k,-a shell closed at the front to form a face plate and open at the rear, a mounting member elosin the rear of the shell, :1 gear arranged within the shell, jaws slidably mounted for radial paws and the gear whereby the movement of the latter is transmitted to said jaws, and a screw shaft to rotate thelatter, the, radial playof the jaws, the length -of the links,

and the range of rotation of the gear being such that the jaws may be thrown in both directions by inner face with.

movement on the.face. plate, link connections between the rotation of the gear in o ne.

2. In a chuck, a shellclosed at the front to form a face plate and open at the rear,

a mounting ineniber'fitted Within and closing the rear of the shell and provided upon its an annular rib, a gear arranged within the shell and provided on one face with an annular groove to receive the [said annular rib of the mounting memher to guide and center said gear in the shell, jaws slidahly mounted on the face plate, links playing through the shelland pivoted'to the jaws and to the other face of the gear, wherebv movement of the latter is transmitted to the jaws, and a screw shaft to'rotate thegezu'.

In testimony that I claim the foregoing as my own I have hereto afli'xed my signature.

A DOLFj HALTMAN, 

